Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1994-05-31
1995-02-21
Kuntz, Curtis
Telephonic communications
Audio message storage, retrieval, or synthesis
379 60, 379 59, 455 332, H04M 1100, H04Q 700
Patent
active
053923316
ABSTRACT:
A method and apparatus in a digital wireless communication system (100) controls an inter-cell hand-off. First and second fixed units (102) receive a common synchronization signal from a controller (104), and a first wireless link is established between the first fixed unit and a portable unit (120) on a first frequency. The first wireless link is synchronized to the common synchronization signal, and frame synchronization is obtained between the fixed unit (102) and the portable unit (120) during establishment of the first wireless link. Frame synchronization is maintained only by maintaining bit synchronization while transmitting user data on the first frequency. A second wireless link is established between the second fixed unit (102) and the portable unit (120) on the first frequency if the first frequency is usable therebetween. The second wireless link is synchronized to the common synchronization signal. The first wireless link is disconnected after the second wireless link is established, thereby seamlessly completing the inter-cell hand-off.
REFERENCES:
patent: 3764747 (1973-10-01), Nakajima et al.
patent: 3906166 (1975-09-01), Cooper et al.
patent: 4654867 (1987-03-01), Labedz et al.
patent: 5148548 (1992-09-01), Meche et al.
patent: 5175867 (1992-12-01), Wejke et al.
patent: 5203012 (1993-04-01), Patsiokas et al.
patent: 5239676 (1993-08-01), Strawezynski et al.
patent: 5243653 (1993-09-01), Malek et al.
European Telecommunications Standards Institute, "CT2 Common Air Interface," Version 1.1, all pages, Jun. 30, 1991, United Kingdom.
Mitel Corporation, "Microelectronics Digital Communications Handbook," Issue 8, pp. 9-65 through 9-82, Canada.
Krishna Prathivadhi B.
Marko Paul
Patsiokas Stelios J.
Wadin Craig
Breeden R. Louis
Chernoff Michael B.
Kuntz Curtis
Motorola Inc.
LandOfFree
Method and apparatus for performing a hand-off in a wireless com does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for performing a hand-off in a wireless com, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for performing a hand-off in a wireless com will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1940605